下面所列选项哪个是地下茎（）
A.马玲薯
B.芋
C.荸荠
D.胡萝卜
参考答案：A, C, D
—Sandy, I called you at 9:00 last night, but nobody answered thephone.
—I'm sorry. We _____ a birthday party _____ Jerry.[ ]
A. had;with
B. were having;for
C. are having;for
D. had;for
根据企业所得税法的规定，扣缴义务人每次代扣得税款，应当自代扣之日起( )日内缴入国库。
A．7
B．10
C．15
D．5
